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 FileMaker Pro Custom Functions

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ExtractPortion ( textField ; prePortion ; postPortion )

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  Average rating: 4.0  (38 votes)
  Discuss this Custom Function

Doug Elam, US Home Systems, Inc.

Extract a portion of a text field

Sample Input:
ExtractPortion ( "" ; "www." ; ".com" )
Sample Output:

 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed


The "middle" function is nice, but it requires you to know how many characters you want to extract. Sometimes, you don't know this, so you have to make complicated calculations to extract data. This is a simple function to extract data between point A and point B.

Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it


Note that this extracts the contents between the first occurrences of prePortion & postPortion in the text.

Daniel Wood, New Zealand
September 22, 2010 2:39pm

This function actually fails in instances where the first occurrence of the postPortion is before the first occurrence of the prePortion.

<div class='test'>some content</div>
<div class='test2'>some content</div>

If I run:
ExtractPortion ( thatfield ; "<div class='test2'>" ; "</div>" )

it will fail due to the first "</div>" occurrence.

You can correct this in changing:
end = Position ( text ; postPortion ; 1 ; 1 ) - 1 ;

to this:
end = Position ( text ; postPortion ; start ; 1 ) - 1 ;

Mike Beargie, Columbus, Oh
September 30, 2017 1:24pm

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